Abstract/Summary

This paper presents the application of three publicly available biota dose assessment models (the ERICA
Tool, R&D128/SP1a and RESRAD-BIOTA) to an assessment of the Drigg coastal sand dunes. Using
measured 90Sr, 99Tc, 137Cs, 238Pu, 239þ240Pu and 241Am activity concentrations in sand dune soil, activity
concentration and dose rate predictions are made for a range of organisms including amphibians, birds,
invertebrates, mammals, reptiles, plants and fungi. Predicted biota activity concentrations are compared
to measured data where available. The main source of variability in the model predictions is the transfer
parameters used and it is concluded that developing the available transfer databases should be a focus of
future research effort. The value of taking an informed user approach to investigate the way in which
models may be expected to be applied in practice is highlighted and a strategy for the future development
of intercomparison exercises is presented.